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+++ Libc/Libc-262/stdio/freopen.c
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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License"). You may not use this file except in compliance with the
+ * License. Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ *
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "local.h"
+
+/*
+ * Re-direct an existing, open (probably) file to some other file.
+ * ANSI is written such that the original file gets closed if at
+ * all possible, no matter what.
+ */
+FILE *
+freopen(file, mode, fp)
+ const char *file, *mode;
+ register FILE *fp;
+{
+ register int f;
+ int flags, isopen, oflags, sverrno, wantfd;
+
+ if ((flags = __sflags(mode, &oflags)) == 0) {
+ (void) fclose(fp);
+ return (NULL);
+ }
+
+ if (!__sdidinit)
+ __sinit();
+
+ /*
+ * There are actually programs that depend on being able to "freopen"
+ * descriptors that weren't originally open. Keep this from breaking.
+ * Remember whether the stream was open to begin with, and which file
+ * descriptor (if any) was associated with it. If it was attached to
+ * a descriptor, defer closing it; freopen("/dev/stdin", "r", stdin)
+ * should work. This is unnecessary if it was not a Unix file.
+ */
+ if (fp->_flags == 0) {
+ fp->_flags = __SEOF; /* hold on to it */
+ isopen = 0;
+ wantfd = -1;
+ } else {
+ /* flush the stream; ANSI doesn't require this. */
+ if (fp->_flags & __SWR)
+ (void) __sflush(fp);
+ /* if close is NULL, closing is a no-op, hence pointless */
+ isopen = fp->_close != NULL;
+ if ((wantfd = fp->_file) < 0 && isopen) {
+ (void) (*fp->_close)(fp->_cookie);
+ isopen = 0;
+ }
+ }
+
+ /* Get a new descriptor to refer to the new file. */
+ f = open(file, oflags, DEFFILEMODE);
+ if (f < 0 && isopen) {
+ /* If out of fd's close the old one and try again. */
+ if (errno == ENFILE || errno == EMFILE) {
+ (void) (*fp->_close)(fp->_cookie);
+ isopen = 0;
+ f = open(file, oflags, DEFFILEMODE);
+ }
+ }
+ sverrno = errno;
+
+ /*
+ * Finish closing fp. Even if the open succeeded above, we cannot
+ * keep fp->_base: it may be the wrong size. This loses the effect
+ * of any setbuffer calls, but stdio has always done this before.
+ */
+ if (isopen)
+ (void) (*fp->_close)(fp->_cookie);
+ if (fp->_flags & __SMBF)
+ free((char *)fp->_bf._base);
+ fp->_w = 0;
+ fp->_r = 0;
+ fp->_p = NULL;
+ fp->_bf._base = NULL;
+ fp->_bf._size = 0;
+ fp->_lbfsize = 0;
+ if (HASUB(fp))
+ FREEUB(fp);
+ fp->_ub._size = 0;
+ if (HASLB(fp))
+ FREELB(fp);
+ fp->_lb._size = 0;
+
+ if (f < 0) { /* did not get it after all */
+ fp->_flags = 0; /* set it free */
+ errno = sverrno; /* restore in case _close clobbered */
+ return (NULL);
+ }
+
+ /*
+ * If reopening something that was open before on a real file, try
+ * to maintain the descriptor. Various C library routines (perror)
+ * assume stderr is always fd STDERR_FILENO, even if being freopen'd.
+ */
+ if (wantfd >= 0 && f != wantfd) {
+ if (dup2(f, wantfd) >= 0) {
+ (void) close(f);
+ f = wantfd;
+ }
+ }
+
+ fp->_flags = flags;
+ fp->_file = f;
+ fp->_cookie = fp;
+ fp->_read = __sread;
+ fp->_write = __swrite;
+ fp->_seek = __sseek;
+ fp->_close = __sclose;
+ return (fp);
+}